On Factors behind the Reasonable Failure Mode of Concrete-Filled Circular Steel Tubular Composite Frame

Table 2

Information of frames.

ηc	3 stories and 5 stories					8 stories and 10 stories
	Column section (mm)	Concrete	Steel	Beam span l(m)	Column section (mm)	Concrete	Steel	Beam span l(m)
1.0	450 × 6	C30	Q235	9.3	450 × 8	C35	Q235	9.1
1.2	450 × 8	C35	Q235	8.1	460 × 10	C40	Q235	7.5
1.6	470 × 10	C40	Q235	6.2	500 × 8	C40	Q345	6.1
2.0	500 × 8	C40	Q345	5.4	500 × 12	C40	Q345	5.2